21369809495 has 8 divisors (see below), whose sum is σ = 25644595200. Its totient is φ = 17095298400.

The previous prime is 21369809479. The next prime is 21369809563. The reversal of 21369809495 is 59490896312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21369809495 - 2⁴ = 21369809479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21369809495.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193706 + ... + 283304.

It is an arithmetic number, because the mean of its divisors is an integer number (3205574400).

Almost surely, 2^21369809495 is an apocalyptic number.

21369809495 is a deficient number, since it is larger than the sum of its proper divisors (4274785705).

21369809495 is an equidigital number, since it uses as much as digits as its factorization.

21369809495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137305.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 21369809495 in words is "twenty-one billion, three hundred sixty-nine million, eight hundred nine thousand, four hundred ninety-five".